Number Selection
Choose any amount of numbers, for example 7 numbers. Have a friend, at random, say 7 different numbers out loud. Repeat the numbers back until you get the numbers right. Each time you get the number set right, you should increase the set, for example expand the next game to 8 numbers, then 9 and so on.
Matching Problems
This game requires the use of 24 cards, each containing a math equation with no answers. Of the 24 cards, 2 of each card should come to the same answer but have a different math equation. So, two matching cards could be "2 X 4 = ?" and "6 + 2 = ?" since the answer to both of them is 8. Now, flip each card over and scramble them around. The game is to try to match similar mathematical equations by flipping each card over and matching the cards.
Timed Games
With a timer and a few index cards, have someone write down random mathematical equations. You can have as many equations as you want to use in this game. Then, write on separate index cards the answers to every equation. Lay out the answers and have them in front of you. Then, have a friend time you to guess each equation. You will have to remember which answers you already chose from the card answers and you can try to beat your timed record each time.
Association Games
If the game is meant for children, one of the best ways to associate numbers with words, or vice versa, is with an association game. Take a few index cards and draw out a number on a few of them. On a corresponding card, either draw an image of that number, such as 4 squares or 3 circles, or spell out the number, like four or three. The child has to match the drawn number card with the corresponding card. For children, this is a good way to associate and remember what each number means from such a game.